I have iTerm2.app, with a custom font (monoOne https://github.com/madmalik/monoOne).
Here is a screenshoot of the output of prettyping. http://d.pr/i/7X0S
The unicode characters seems to render badly. Also the "Request timeout for icmp_seq 378" message is not parsed and printed.
If you need more informations about my configuration, ask me. I use tmux.